v0.15.4

Component Fixes / Enhancements

• [BottomNavigation] Initial implementation (#4846)
• [DropDownMenu] Revert the commit causing a regression in 0.15.3 (#f76302e)
• [Snackbar] Add the material fontFamily (#4892)
• [ListItem] New property open to toggle nested list (#4850)
• [Slider] Fix an issue where not updating when max prop changes (#4895)
• [Slider] Fix more warnings introduced by React v15.3.0 (#4869)

Docs

• [js] Explain the ECMAScript stage-1 dependencies of the examples (#4877)